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Can anyone tell me what the part number is for the thermostat housing that is used on a Non-Turbo car with a factory oil cooler?? (pre 2004) Forester had this, for example... from what I can tell, after 2004 they all seem to be mounted from the front

It is the same style as a regular water pump where the thermostat housing bolts up from the bottom, not from the front, except it has an extra inlet on the passenger side of the housing

It's hard to tell from parts diagrams since I can't find actual part numbers...

It seems so, because I was looking at my first setup yesterday and it is plumbed into the thermostat cover, I couldn't remember if I had changed the water pump to get it installed.

So since I'm doing it ALL over again, that cover is what I need(in addition to all those hoses you found numbers for)... I just got some Impreza part manuals, but as you have just indicated, they don't help!!

since no model of domestic Impreza has that, a Forester part number is what I'm after...